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Color (beta) Automatic. Light. Dark. This page is always in light mode. ... Gemstones of the World revised 5th edition, 2013 by Walter Schumann ISBN 978-1454909538;
Whether a gemstone is a natural stone or synthetic, the chemical, physical, and optical characteristics are the same: They are composed of the same mineral and are colored by the same trace materials, have the same hardness and density and strength, and show the same color spectrum, refractive index, and birefringence (if any). Lab-created ...
Certain synthetic color-change sapphires have a similar color change to the natural gemstone alexandrite and they are sometimes marketed as "alexandrium" or "synthetic alexandrite". However, the latter term is a misnomer: synthetic color-change sapphires are, technically, not synthetic alexandrites but rather alexandrite simulants .
Glass Gem corn, a unique variety of rainbow-colored corn, became an Internet sensation in 2012 when a photo of the sparkling cob was posted to Facebook.. Shortly after, the company that sells the ...
Crazy lace agate is a brightly colored lace agate from Mexico with a complex pattern, demonstrating randomized distribution of contour lines and circular droplets, scattered throughout the rock. The stone is typically colored red and white but is also seen to exhibit yellow and grey combinations as well. [19]
For example, blue indicolite tourmaline is the only blue gemstone of any kind that will show a drag response when a neodymium magnet is applied. Any blue tourmaline that is diamagnetic can be identified as paraiba tourmaline colored by copper in contrast to magnetic blue tourmaline colored by iron. [22]